Cystic Fibrosis Drug Wins Approval

The Food and Drug Administration has approved the first drug that can treat the underlying cause of cystic fibrosis.

The drug, known as Kalydeco, works by helping to fix one defect in the protein that causes the disease.

About 30,000 Americans have cystic fibrosis, a genetic disorder that can cause sticky mucus to build up in the lungs. That leads to life-threatening infections and other potentially serious complications. Although treatments for symptoms have helped cystic fibrosis patients live longer, the patients often die before reaching middle age.

"Eventually the lungs are destroyed and they have a premature death," said Robert Beall of the Cystic Fibrosis Foundation.

But it turned out to be a lot more complicated than anyone thought. Attempts to fix the broken gene with gene therapy, for example, didn't work out. That left patients with drugs that did little more than thin out the mucus that builds up in their lungs.

Frustrated by the slow progress of research, Beall's foundation invested $75 million in a quest for drugs that do more than just treat symptoms. That led to Kalydeco's approval Tuesday.

"Where these other drugs treat the symptoms of cystic fibrosis," Beall said, "Kalydeco treats the underlying cause of this disease."

Studies showed that Kalydeco can make a big difference for a few patients — the ones who have the specific defect that it helps to fix.

Emily Schaller, 29, who lives outside Detroit, is one of them. For most of her life, she was constantly getting infections and struggling to breathe. "It's like, you try to take a deep breath but you just can't because your airways are blocked with that mucus," Schaller said.

But within days of starting to take Kalydeco as part of a study, Schaller noticed a huge difference.

"My friends and I and family like to joke, and when I would laugh before, I would go into a coughing fit for five minutes and need five or 10 minutes to recover from this coughing fit. But now it's like I can laugh and not cough after fit. And that's just so refreshing, because all I like to do is laugh," she said.

Now, there's one big drawback to the drug: It will only work for about 1,200 patients in the U.S. But researchers have started testing combining Kalydeco with another drug that targets a much more common defect. Researchers hope the two-drug combination will help perhaps 90 percent of patients.

"The science underlying Kalydeco has clearly paved the way for us to think about how we can impact upon all individuals with cystic fibrosis," Beall said.

It will be years before anyone knows whether the newer approach works. In the meantime, at least some patients can start using Kalydeco.

Kalydeco costs nearly $300,000 a year for each patient, according to Vertex Pharmaceuticals, the company that makes the drug.

Vertex has promised to help. Among other things, Vertex says it will give the drug away to anyone who does not have insurance and makes less than $150,000 a year.

Copyright 2012 National Public Radio. To see more, visit http://www.npr.org/.